Info needed: 1967 M38A1 Lubrication?

[Les Kovacs]

Thanks Rob & Terry for your input on my last "hub" question.

Rob......update on the rad/coolant/temp issue.....so, before work on the cooling system (old coolant, old leaking water pump, puking rad coolant after shutdown, temp gauge always fogging up and no thermostat whatsoever, the temp gauge never read over 140 F.)
Now, after professionally flushing the rad, adding in a 160 F thermostat and a new 3 pulley water pump and adding new coolant at about 60/40 coolant to water ratio regardless how the jeep is driven, the temp gauge rarely fogs up, the rad never pukes coolant anymore, however, the temp gauge now always just gets a hair past 180 F (never any higher)...why? and what may be the issue?....bad thermostat?.....bad temp gauge? or bad sender?....just after shutdown the rad coolant temp at the rad cap always reads about 155-160 F.
Is the thermostat not opening?

Thanks,

les

[rob love]

If the temp is truly 185*°, that is not a problem, the cooling system is fine at that temp. Did you try a mechanical gauge to confirm that temp though?

I had our ceremonial M38A1cdn3 out for a run the other day and it too runs at 185*°. I can't say what mine runs at....unless it crosses the 200 mark I don't consider it a problem. The real problems start at around 230 to 240, when the coolant will start to boil.

[Les Kovacs]

Hi Rob....no, I have not tried a mechanical gauge as I do not know how and I have never seen a mechanical gauge that replaces a proper sending unit.

As previously mentioned, several times right after shut off I cracked the rad cap and quickly put in a temp gauge meant for fluid immersion and the temp is always at 155-160F.

Where can I get a mechanical gauge and where does it plug in?

Also, why would the average coolant temp rise from 130-140 F to 180-185 F after having the rad flushed, a thermostat installed and a new water pump?

les

[rob love]

http://www.ebay.com/itm/NEW-SuperPro...UAAOSwZQRYbUaW

Temp went up because you installed a thermostat. What we need to do now is determine if you have the same readout between your thermometer and your gauge. Then again, one has to ask why? You are not having any problems now...perhaps quit chasing the red herring and enjoy the Jeep.

[Les Kovacs]

Hi Rob....thanks for the quick response...your right.....I should be enjoying the jeep which I am....almost every warm/dry day my wife and I go out for a 10-20 km drive....the jeeps driveability is a little better after I adjusted the carb mixture-smoother after 1/8 turn counter-clockwise (leaner) as you had explained.
However, as I want this jeep to live a long life with the engine it has I need to know the true engine temp (if the gauge/sending unit is bad it could be reading temps past 200 F and I will never know) as well as the true oil pressure (pressure gauge now reads 50 psi after start and after about 10 min of driving but then after a few more min reads 20-30 psi when driving)....so I am somewhat anal when it comes to true engine operating parameters.

Another question...I shift by sound and jeep vibration....I usually shift to 3rd at around 25 MPH (if gauge is somewhat accurate) but get a mild shudder until about 35 MPH....is shifting to 3rd at 25 MPH lugging the engine?....when are your shifts?

Many thanks,

les

[Les Kovacs]

Hi Rob....as per one of your earlier posts/reply's to my questions you had mentioned that a 13/16 deep socket was required to un-screw the spark plugs...I purchased a 13/16 deep socket at Princess Auto....the socket was the deepest at 3.0 inches overall length....it does not fit....it appears that a socket to fit the depth of the plugs would required an additional 1/4 inches of length. Any idea where to buy a longer(3.25 inch long) 13/16 deep socket?.....I really do not want to spend $40.00/US to order a special plug socket wrench if I do not have to.

Thanks for all the other great ideas and tips.

les

[rob love]

Both proto and gray brand 1/2" drive deep length sockets will do the trick. There will no doubt be others. Forget about spark plug sockets, they are too short internally.

I just went to the tool box to try some others out, and my 1/2 dr princess auto socket only barely makes it onto the hex, so I won't reccoment that socket. However I tried a westward 3/8 drive 13/16 socket and it fit well. Part number is DS386K.

Best bet is to take a spark plug to the tool store with you and try some out. Plugs are not in that tight, so you don't need top quality.